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B4 is another tool for creating incremental backups using btrfs subvolumes.
It comes with the following features:
- Backup remote systems or subvolumes
- Backup subvolumes inside subvolumes recursively
- Restore snapshots by replacing or copying them side by side
- Apply rules which subvolumes to keep and how to restore them
- Apply rules how long to keep the backups and at which density.
- Python 3.12 or higher
- A btrfs partition on the machine you want to backup and your backup destination.
- btrfs-progs
Take a look at theinstallation guide to get started.Once installed, you might take a look at theexample use cases to get a starting point.
This is just an example to explain the most important features.More examples can be found here
Let's say we want to backup a server with a nextcloud instance on it. The btrfs subvolume we want to backup is/opt/nextcloud. This is where we store all nextcloud-related data.
backup_targets:# This is just a name, we want to give our targetnextcloud.example.com:# The location which we want to backupsource:ssh://root@nextcloud.example.com/opt/nextcloud# The location where we want to store the backups.# A local path means, that the backups are stored on the same machine as b4.destination:/opt/backups# In order to be able to send snapshots incrementally, we need to have at least one parent snapshot on source side.# Here we can define how many snapshots we want to keep for which amount of time.src_retention:auto:# You can create multiple rulesets, to be able to handle manual snapshots differently than automatic ones.all:"3"# Keep only 3 snapshots on source sidemanual:all:"7days"# Keep all snapshots for 7 days on a manual backup# The same applies to the destination side.dst_retention:auto:1day:1month# Keep daily snapshots for 1 month1week:1year# After that remove as many snapshots to only weekly snapshots remain, which are kept fpr a year1month:forever# After a year keep snapshots at a monthly interval forevertimezone:utc# While using the CLI, these are the targets which are used by default.default_targets: -nextcloud.example.com
To actually create a backup, you can use the following command:
b4 backup
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A versatile backup manager using btrfs snapshots for incremental local and remote backups
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